OPROCd
OPROCd provides the server fencing solution for the Oracle Clusterware. It is the process monitor for Oracle Clusterware and it uses the hang check timer or watchdog timer (depending on the implementation) for the cluster integrity. OPROCd is locked in the memory and runs as a real time process. This sleeps for a fixed time and runs as the "root" user. Failure of the OPROCd process causes the node to restart.
Read more about this topic: Oracle Clusterware
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